Methods for treating carbonate hydrocarbon-bearing formations with fluorinated amine oxides

Abstract

A method of treating a carbonate hydrocarbon-bearing formation is disclosed. The method includes contacting the hydrocarbon-bearing formation with a composition comprising solvent and a fluorinated amine oxide. Carbonate hydrocarbon-bearing formations treated according to the method are also disclosed.

What is claimed is: 
     
       1. A method of treating a hydrocarbon-bearing formation, the method comprising contacting the hydrocarbon-bearing formation with a treatment composition comprising solvent and a fluorinated amine oxide, wherein a surface of the hydrocarbon-bearing formation comprises a carbonate, and wherein the fluorinated amine oxide is non-polymeric. 
     
     
       2. A method according to  claim 1 , wherein the solvent comprises at least one of water, a monohydroxy alcohol, an ether, a ketone, a glycol, a glycol ether, or supercritical carbon dioxide. 
     
     
       3. A method according to  claim 1 , wherein the fluorinated amine oxide is represented by formula Rf-Q-N(R) 2 —O,
 wherein
 Rf is independently fluoroalkyl having up to 10 carbon atoms; 
 Q is —SO 2 —N(R′)—W—, —C(O)—N(R′)—W—, alkylene, arylalkylene, or arylene, wherein alkylene and arylalkylene are each optionally interrupted by —O—, —S—, —SO 2 — or —C(O)—; 
 R′ is hydrogen, alkyl having up to six carbon atoms, or aryl; 
 W is alkylene, arylalkylene, or arylene, wherein alkylene and arylalkylene are each optionally interrupted by —O— or —S— and optionally substituted by hydroxyl; and 
 each R is independently hydrogen, alkyl, or aryl, wherein alkyl may optionally be interrupted by —O— or substituted with hydroxyl or aryl, or two R groups taken together with the N atom to which they are attached can form a heterocyclic ring having up to six carbon atoms and optionally containing —O— or —S—. 
 
 
     
     
       4. A method according to  claim 3 , wherein Rf is perfluoroalkyl having up to 6 carbon atoms, Q is —SO 2 —N(R′)—W— or alkylene having up to four carbon atoms, wherein R′ is hydrogen or alkyl having up to four carbon atoms, wherein W is alkylene having up to 4 carbon atoms, and wherein R is alkyl having up to four carbon atoms. 
     
     
       5. A method according to  claim 1 , wherein the fluorinated amine oxide is represented by formula Rf-Q-N(R) 2 —O,
 wherein Rf is selected from the group consisting of:
   Rf a —(O) r —CHF—(CF 2 ) n′ —;
 
   [Rf b —(O) t —C(L)H—CF 2 —O] m —W″—;
 
   CF 3 CFH—O—(CF 2 ) p′ —;
 
   CF 3 —(O—CF 2 ) z —; and
 
   CF 3 —O—(CF 2 ) 3 —O—CF 2 —;
 
 
 
       wherein
 Rf a  and Rf b  independently represent a partially or fully fluorinated alkyl group having from 1 to 10 carbon atoms and optionally interrupted with at least one oxygen atom; 
 L is selected from the group consisting of F and CF 3 ; 
 W″ is selected from the group consisting of alkylene and arylene; 
 r is 0 or 1, wherein when r is 0, then Rf a  is interrupted with at least one oxygen atom; 
 t is 0 or 1; 
 m is 1, 2, or 3; 
 n′ is 0 or 1; 
 each p′ is independently an integer from 1 to 6; and 
 z is an integer from 2 to 7; 
 wherein Q is —CO—N(R′)—W—, wherein R′ is hydrogen or alkyl having up to four carbon atoms, wherein W is alkylene having up to 4 carbon atoms, and wherein R is alkyl having up to four carbon atoms. 
 
     
     
       6. A method according to  claim 1 , wherein the fluorinated amine oxide is represented by formula 
       
         
           
           
               
               
           
         
         wherein
 Rf is independently fluoroalkyl having up to 10 carbon atoms; 
 Q′ is —SO 2 N(—)(—), —(CH 2 ) p CH(O—)(—), or —(CH 2 ) p —CH(O—)(CH 2 ) p O—, where p is an integer of 1 to 11; 
 W′ is alkylene, arylalkylene, or arylene, wherein alkylene and arylalkylene are each optionally interrupted by —O— or —S— and optionally substituted by hydroxyl; 
 each R is independently hydrogen, alkyl, or aryl, wherein alkyl may optionally be interrupted by —O— or substituted with hydroxyl or aryl, or two R groups taken together with the N atom to which they are attached can form a heterocyclic ring having up to six carbon atoms and optionally containing —O— or —S—; and 
 each n is independently 0 to 11. 
 
       
     
     
       7. A method according to  claim 1 , further comprising:
 receiving data comprising a temperature and a brine composition of the hydrocarbon-bearing formation; and 
 selecting the treatment composition for treating the hydrocarbon-bearing formation, wherein, at the temperature, a mixture of an amount of the brine composition and the treatment composition is transparent and free of precipitated solid, and wherein the mixture does not separate into layers. 
 
     
     
       8. A method according to  claim 1 , further comprising:
 receiving data comprising a temperature and a brine composition of the hydrocarbon-bearing formation; and 
 selecting the treatment composition for treating the hydrocarbon-bearing formation, wherein, at the temperature, a mixture of the brine composition and the treatment composition separates into at least two separate transparent liquid layers, and wherein the mixture is free of precipitated solid. 
 
     
     
       9. A method according to  claim 1 , further comprising:
 receiving data comprising a temperature and a first brine composition of the hydrocarbon-bearing formation; 
 contacting the hydrocarbon-bearing formation with a fluid, wherein after the fluid contacts the hydrocarbon-bearing formation, the hydrocarbon-bearing formation has a second brine composition that is different from the first brine composition; and 
 selecting the treatment composition for treating the hydrocarbon-bearing formation, wherein, at the temperature, a mixture of an amount of the second brine composition and the treatment composition is transparent and free of precipitated solid, and wherein the mixture does not separate into layers. 
 
     
     
       10. A method according to  claim 1 , the method further comprising fracturing the hydrocarbon-bearing formation, wherein contacting the hydrocarbon-bearing formation with the treatment composition is carried out during the fracturing, after the fracturing, or during and after the fracturing. 
     
     
       11. A method according to  claim 1 , wherein the method does not include intentionally fracturing the hydrocarbon-bearing formation. 
     
     
       12. A method according to  claim 1 , wherein the fluorinated amine oxide is present in the treatment composition in at up to 2 weight percent, based on the total weight of the treatment composition. 
     
     
       13. A method according to  claim 1 , wherein the hydrocarbon-bearing formation is a gas producing formation penetrated by a wellbore, and wherein a region near the wellbore is contacted with the treatment composition. 
     
     
       14. A method according to  claim 1 , wherein the hydrocarbon-bearing formation comprises limestone. 
     
     
       15. A method according to  claim 1 , wherein before contacting the hydrocarbon-bearing formation with the treatment composition, the hydrocarbon-bearing formation has retrograde gas condensate, volatile oil, or black oil, and wherein the hydrocarbon-bearing formation has an increase in at least a gas permeability after it is contacted with the treatment composition. 
     
     
       16. A method according to  claim 1 , wherein the hydrocarbon-bearing formation has at least one fracture, and wherein the at least one fracture has a plurality of proppants therein. 
     
     
       17. A method according to  claim 16 , wherein the proppants comprise ceramic proppants. 
     
     
       18. A method according to  claim 17 , wherein the proppants comprise bauxite proppants. 
     
     
       19. A method according to  claim 1 , wherein the fluorinated amine oxide is adsorbed on the hydrocarbon-bearing formation. 
     
     
       20. A hydrocarbon-bearing formation treated according to the method of  claim 1 .